Alaska earthquakes

M1.7 earthquake 209 km S of Adak, Alaska

A magnitude 1.7 earthquake struck 209 km S of Adak, Alaska on Thu, Aug 19, 2021, 4:05 PM HADT (01:05 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M4.5 161 km S of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
1.7 (ml), micro
Local time
UTC
2021-08-20 01:05:36 UTC
Depth
21.0 km (13.0 mi), shallow
Epicenter
50.013° N, 177.049° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used
22

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 3.4200 km SSW of Adak, Alaska · 1861 days ago · 10 km deep · 19 km away
  2. 2.1186 km SSW of Adak, Alaska · 1860 days ago · 26 km deep · 58 km away
  3. 2.0183 km S of Adak, Alaska · 1851 days ago · 25 km deep · 26 km away
  4. 1.8147 km S of Adak, Alaska · 1848 days ago · 25 km deep · 76 km away
  5. 1.7111 km S of Adak, Alaska · 1843 days ago · 35 km deep · 98 km away
  6. 4.5161 km S of Adak, Alaska · 1835 days ago · 10 km deep · 73 km away
  7. 2.4163 km S of Adak, Alaska · 1835 days ago · 24 km deep · 72 km away
  8. 3.4204 km SSW of Adak, Alaska · 1835 days ago · 10 km deep · 73 km away
  9. 3.1164 km S of Adak, Alaska · 1834 days ago · 10 km deep · 72 km away
  10. 3.1Andreanof Islands, Aleutian Islands, Alaska · 1825 days ago · 10 km deep · 58 km away
  11. 3.9177 km SSW of Adak, Alaska · 1823 days ago · 10 km deep · 87 km away
  12. 2.3179 km SSW of Adak, Alaska · 1821 days ago · 25 km deep · 86 km away
  13. 3.7187 km S of Adak, Alaska · 1813 days ago · 10 km deep · 54 km away

Before

  1. 1.9241 km S of Adak, Alaska · 1862 days ago · 12 km deep · 32 km away
  2. 3.2198 km S of Adak, Alaska · 1867 days ago · 10 km deep · 17 km away
  3. 2.1226 km SSW of Adak, Alaska · 1876 days ago · 20 km deep · 59 km away
  4. 1.9180 km S of Adak, Alaska · 1876 days ago · 24 km deep · 63 km away
  5. 2.5168 km SSW of Adak, Alaska · 1880 days ago · 10 km deep · 84 km away
  6. 1.9211 km SSW of Adak, Alaska · 1882 days ago · 26 km deep · 87 km away
  7. 1.9176 km SSW of Adak, Alaska · 1883 days ago · 26 km deep · 88 km away
  8. 1.8164 km S of Adak, Alaska · 1885 days ago · 17 km deep · 46 km away
  9. 3.4219 km SSW of Adak, Alaska · 1886 days ago · 43 km deep · 40 km away
  10. 1.9170 km SSW of Adak, Alaska · 1888 days ago · 26 km deep · 43 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak021anpb3k9. Read Thu, Sep 24, 2026, 11:09 AM UTC.